Apparently, she's not lip-syncing.

In a 2009 video trending on Reddit this week, a maid of honor gave the bride a special performance of "Come Sail Away" by Styx. Only, she added her own special flair to the song by singing it in Eric Cartman's voice from South Park. Her flawless impression has the audience laughing and singing along, and according to the YouTube description, the maid of honor is not lip-syncing.

In the words of YouTuber colsonpz04, this truly is "the gift that keeps on giving."